Experimental Investigation of CO₂–Brine–Rock Interactions in Mishrif Carbonate Reservoir, Southern Iraq

Fatima Ibraheem Naef, Department of Petroleum Engineering, College of Engineering, university of Baghdad, Baghdad, IraqFollow
Mohammed Saleh AL-Jawad, Department of Petroleum Engineering, College of Engineering, university of Baghdad, Baghdad, Iraq

Article Type

Research Paper

Abstract

Carbon dioxide injection into carbonate reservoirs is a process widely considered for mitigating CO₂ emissions. The objective of this study is to evaluate the feasibility of geologic CO₂ sequestration in terms of CO₂ -brine-rock interactions. Static pressurized experiments were conducted with carbonate rocks at 25°C and 60 bar pressure for 7, 14, and 21 days.CO₂ -brine-rock interactions were inferred from the evaluation of Ca²⁺ and Mg²⁺ and by observing brine density and viscosity. The rock's porosity was measured before and at the end of the experiment. The result showed an increase in rock porosity and brine ion concentrations, viscosity, density, and pH after 7 days; however, the intensity of these changes almost stabilized after 14 days and 21 days. Chemical analysis of brine suggested the dissolution of calcite and dolomite. This study provides experimental insights into the time-dependent interactions of carbon dioxide with brine and rock, relevant to Iraqi carbonate reservoirs and similar geological environments.

Keywords

geologic CO₂ sequestration; carbonate rocks; porosity; mineralogical properties

Recommended Citation

Naef, Fatima Ibraheem and AL-Jawad, Mohammed Saleh (2026) "Experimental Investigation of CO₂–Brine–Rock Interactions in Mishrif Carbonate Reservoir, Southern Iraq," Egyptian Journal of Petroleum: Vol. 35 : Iss. 4 , Article 11.
Available at: https://doi.org/10.62593/2090-2468.1136